From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Drawing of a pressure ring showing distortion and surface cracks following a 20,000-mile road test in France.
| Identifier | ExFiles\Box 91\4\ scan0277 | |
| Date | 4th March 1935 | |
| SPECTRECodename for Phantom III 3 PRESSURE RING G.82609/e AFTER 20,000 MILES ROAD TEST IN FRANCE .018" DISTORTION SMALL SURFACE CRACKS . OCCUR ON FRICTION FACE ADJACENT TO EACH LUG SECTION | ||